Top 550+ Solved Machine Design MCQ Questions Answer
Q. In most machine members, the damping capacity of the material should be
a. Anything
b. Zero
c. High
d. Around zero
e. Low
Q. The loading on a pinion gear is usually
a. Compression
b. Tension
c. Shear
d. Cyclic loading
e. None of the above
Q. St, Venant's theory for failure of material is based on
a. maximum shear stress
b. maximum strain energy
c. maximum tensile stress
d. none of the above
e. Increasing the diameter of threaded portion
Q. The critical speed of a shaft is affected by
a. Diameter of the disc
b. Eccentricity
c. Span of the shaft
d. All of the above
e. None of the above
Q. Stub tooth
a. Has a profile which is involutic at the base and cycloidal at the top
b. Has a profile which is cycloidal at the base and involutic at the top
c. Is provided on racks only
d. Has a profile shorter than the standard tooth
e. Has a profile longer than the standard tooth
Q. Approximate horse power that can be transmitted by a shaft 60 mm diameter at 180 r.p.m. with permissible shear stress of 850 kg/cm2, would be
a. 35-50
b. 85-95
c. 30-35
d. 50-65
e. 65-85
Q. The differential equation 10x + 9 x + 810x = 0 describes a one degree of freedom system. The natural frequency of the system is
a. 90 cycles per second
b. 9 cycles per second
c. 10 cycles per second
d. 90 sycles per second
e. 9 radians per second
Q. The concentric helical springs are wound in opposite direction
a. to maintain identical shear stress in the two springs
b. Increasing the diameter of threaded portion
c. to maintain identical stiffness in both springs
d. to avoid unequal deflection in the two springs
e. to avoid binding of adjacent coils
Q. The rivet diameter should be
a. More than plate thickness
b. Less than the plate thickness
c. Equal to the plate thickness
d. Equal to the strap thickness
e. Half the plate thickness
Q. The period during which a cam follower does not move is known as
a. Free period
b. Swell period
c. Constant period
d. Stationary period
e. Fixed period
Q. A 3 mm diameter rivet must be squeezed to form a head. When yield stress in tension for this alloy is 125 Kpa, the minimum value of initiating force must be not less than
a. 500 N
b. 5000 N
c. 1000 N
d. Increasing the diameter of threaded portion
e. 100 N
Q. Tack welding
a. Is a process of TIG welding
b. Is a type of weld
c. Is used for non-ferrous materials
d. Is a preparation for welding
e. None of the above
Q. Which is the lightest?
a. 10 Quintals
b. 1 British ton
c. 1 U.S. long ton
d. 1 metric ton
e. 1 U.S. short ton